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  1. JD says:

    [contact link is giving errors, so I’m trying this via the reply link]

    Hi
    I have recently bought a mystery “bitsa” car which has a single plug OSCA designed engine of some type.

    Do you know if there a reference checklist I can use to figure out what exactly the engine is?

    I have seen your page on distinguishing the Fiat 1600S and OSCA 1600GT engines, but are there other things I should look for, to handle the other variants?
    In theory it could be—
    Pre 1959 early “true” OSCA engine? (not bloody likely)
    1959-1962 Fiat 1500S?
    1962-1966 Fiat 1600S?
    1962- OSCA 1600 as in 1600GT?
    I don’t even know if there were Fiat-built OSCA 1500 engines around 1959-1961.
    If so, that would make 4-5 possibilities.

    The car is in a different city so, for the moment, I have limited information–I have seen it, but I have just two engine photos. I’ll get the identification numbers and details soon, but I need to know what to look for.

    Right now I assume it’s the Fiat 1500S engine, since that’s the least rare/valuable.
    The only “mismatches” are things that could have been added later, dual down draft Webers and, most interesting, OSCA valve covers which seem to match the type I have seen only on photos of some 1600GTs by Touring (though maybe they are common).
    That is why I am contacting you.
    Hey, a guy can always hope, though it’s likely somebody just added the valve covers for show.

    It looks like 1600GT covers because the word OSCA is centred in the length of the cover rather than offset towards one end, and there are no bolts in the middle of the top, only around the edge.
    Looks like this, but mine has black paint with bare aluminum for the letters.
    http://www.maserati-alfieri.co.uk/enthusiast120/italia-2005-100a.jpg

    Ideally I’d like to hunt down a master geek’s table of engine numbers, types, and production dates, covering all those categories.
    But just a checklist of a couple of tell-tale block markings might do it.
    Something like “if it says Tipo 118S on it that means a Fiat 1500S unit”, and that’s all I really need to know.
    Though I’d love to be able to figure out the date.

    Thanks!
    (happy to provide you with my full real name if you reply by email, I just didn’t want to get it on your web site by accident)

    • OSCA 1600GT Admin says:

      The engine in the picture looks like an OSCA-built engine that went into the 1600 GT. Not all 1600 GT’s received the valve covers with the OSCA logo cast in them (the 1950’s MT-series cars got them, but only a portion of the 1600 GT’s). The acorn style head nuts and other setup looks consistent with the 1600 GT but to confirm you need to look at the oil filter setup and block stamps as previously pointed on on this site.

      With regards to when Fiat 1500S and 1600S engines were produced, here’s a quick bit of information: http://auto.howstuffworks.com/fiat-sports-cars1.htm

      The really valuable “geek” information you are seeking about the Fiat 1500S and 1600S engines are here in the form of a shop manual: https://www.scribd.com/doc/40197446/Fiat-O-S-C-A-1500S-1600S-Service-Manual-Part-1

      Yes, there were 1500S engines built from 1959 – 1962 and then the 1600S engine replaced it. Copies of the 1600 GT homologation papers are on this site and you’ll see that the OSCA-built 1600cc engines were used over a 4-year period to build the 1600 GT cars. Here’s a really nice OSCA history that notes Fiat’s request in 1959 to source an engine design from the Maserati brothers for the Fiat 1200: http://www.uniquecarsandparts.com.au/lost_marques_osca.php

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